The MCN branches to brachialis muscle were derived from main trunk at 1/3 distal upper arm, most of which were single branch with a length of 5.2 cm and an average of 2.7 fascicles.

• 肌皮神经肱肌肌支在上臂下1/3段由主干发出；以单支型为主；肌支长5.；2 cm；平均2